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Moss Agate, despite it's name, contains no moss or plants of any kind. The odd patterns and colors are due to mineral impurities. Nerd Corner Edition: The orange is caused by iron oxide ... the black is caused by manganese oxide! It is commonly found in volcanic rocks and Montana is a huge source of beautiful moss agate that has resulted from activity long ago in the Yellowstone Volcano, particularly in the Yellowstone River.
September 22nd, 2012
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